Inside the Prophet’s Mosque in Medina, the city to which Muhammad migrated in 622Image: بلال الدويك · CC BY-SA 3.0The first day of the Islamic calendar
The Islamic calendar counts its years from the Hijrah, the Prophet Muhammad’s migration from Mecca to Medina in 622. The migration itself took place in September, but when the caliph Umar introduced the era in about 639 he fixed its start at the beginning of that lunar year, 1 Muharram. That day fell on Friday 16 July 622 in the Julian calendar. Because the Islamic year is lunar, about 11 days shorter than the solar year, its months move steadily through the seasons.
Source: Britannica: Hijrah ↗
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